1. Antwerp University Hospital, University of Antwerp, Antwerp, Belgium
2. Ear Science Centre, School of Surgery, The University of Western Australia, Nedlands, Australia
3. Ear Science Institute Australia Implant Centre, Subiaco, Australia
4. Medizinische Universität Wien, Universitätsklinik für Hals-, Nasen- und Ohrenkrankheiten, Vienna, Austria
5. Universitätsklinik für HNO, Kopf- und Halschirurgie, Inselspital Bern, Bern, Switzerland
6. Hospital Universitario La Paz, Institute for Health Research (IdiPAZ), Madrid, Spain
7. Centre Hospitalier Universitaire de Rennes, Rennes, France
8. Klinik und Poliklinik für Hals-, Nasen und Ohren- Krankheiten, Universität Würzburg, Würzburg, Germany
9. Capital Medical University, Beijing Tongren Hospital, Beijing, People’s Republic of China
10. Karolinska University Hospital, Karolinska vägen, 171 76 Solna, Sweden
11. Madras ENT Research Foundation (MERF), No-1, 1st Cross Street, Off. II Main Road, Raja Annamalai Puram Chennai, Tamil Nadu 600028, India
12. St. Petersburg ENT and Speech Research Institute, St. Petersburg, Russia
13. ENT Super Speciality Institute and Research Center, East Hill, Kozhikode, Kerala 673005, India
14. London Health Sciences Centre, London, Canada
15. UNC Ear & Hearing Center at Chapel Hill School of Medicine, 170 Manning Dr #7070 Chapel Hill, NC 27514, USA
16. Bradford Royal Infirmary, Bradford, United Kingdom
17. Otolaryngology, Head & Neck Surgery Unit, School of Surgery, University of Western Australia, Fremantle Hospital, Fremantle, Australia
18. Universitätsklinik für Hals- Nasen- Ohrenheilkunde Innsbruck, Innsbruck, Austria
19. Institute of Physiology and Pathology of Hearing, Warsaw, Poland
20. World Hearing Center, Nadarzyn, Poland
21. Institute of Sensory Organs, Nadarzyn, Poland
22. Kansas University Center for Hearing and Balance Disorders, 3901 Rainbow Blvd, Kansas City, KS 66160, USA
23. Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano 390-8621, Japan
24. Instituto de ORL, Av Ambrosio Olmos 754, Córdoba, Argentina